How would you measure intelligence in something that could be contained in a simple sql query?
Even though IQ isn't exactly the best metric for measuring intelligence (as the test can be gamed and people aren't even sure if it's actually an accurate measure of what we interpret as the definition of "intelligence."), I feel that if I had access to the IQ score of every user that joined HN, I feel this would be the best possible metric we can come up with as IQ does correlate with many real world attributes that we actually do associate with "intelligence."